Boss OD 1 Overdrive Schematic

Page 1

OVER DRIVE
m ma

DEC. 26.1980

1c upmsssc
m 2SK30ATM v '
02 25K30ATM on
(23 ~ 05 zscaas P m PUT _ as
zscmxs v - 51
I A EW-
06 (:7 zscnzm a: ,u a
m Rm 153 3 ""K m'afa Tea
02 $205,155 3 BATTERVE
9v .2 7 :5
n3 - 010 152473 or 151583 .. K ms:
DH SLP V355
JACK CHUCGE
From 70003 to 0317
c --«w r
r. K3}
5 35,:me
1 m, k HDSEIDEN
5 as EEC-0003 ma-ozm-l-l
Contact
m '
4;
mi; mo cu :12 my _
UEPL"
mm C»?! 0 1 ¥-
WAVEFOEI-IS
15 ° TEST SIGNAL:
20019,.
i mm
y Dwarf. m
#\\\l l BGEVpp
®

MUDIZiCATION ON LED DRIVE CIRCUIT

LEI! connecting Lu ET-37E times not 11
mlrlng Effect made. The fellowmg b
lnfarmatiou on modification for cont
LED lighting 1'11 the model

Shift LED blue ;ead @ to Q3
colleozor, at the foil side

(SJIflCe nm'unting) .

2. Replace cm a?) . l/W or .47/30,
with 0.01 mylar capacitor.

Replace Cl) and C14 (3) , 4701313
with 220pF :r flip-flop circui
becomes: unstable at lower Supply
voltages (7-6v).

Inevitably, current draw will in-
crease after unodificatian.

The raw circ ,1. on ET-ZBD is accom-
panied with low-pawermonsumytion
LED SLPlfii-B for 1655 battery drain
When LEDS are Changei, 329 should

also be changed to 3.9x ohms.

SERIALNW '
stamped on case to'

_First two djgi
cycle when DXhEuS od.

4 900?
- 9906
_ 000?

0300

a
_ l219y 13 7 s71? 0300-
sw
EFFECT
mm
M WW
LEVEL: Max LEVEL: Max
OVER mum: Min om DRIVE: Max
ET5201-510A (ET-23DH7520151000)
(pcb 2291032l04/052-281 D)
Seria| mlth with 9000
gkt
+19
lnuous
\
d
on - 1 + + D an
(ET-230) a C 2 04 WE